[trac583] Added a qid_gen for random qids

Simple uniform random number generator using boost.

At this moment, it is in asiolink, because that is where it is used. It should be moved to a lib/util (or something), together with the non-uniform nsas rng.

Also note that IOFetch now *sets* a random qid, but does not actually check it when it receives an answer.

1 files changed, 63 insertions, 0 deletions

diff --git a/src/lib/asiolink/tests/qid_gen_unittest.cc b/src/lib/asiolink/tests/qid_gen_unittest.cc
new file mode 100644
index 0000000000..aa315828f7
--- /dev/null
+++ b/src/lib/asiolink/tests/qid_gen_unittest.cc
@@ -0,0 +1,63 @@
+// Copyright (C) 2011  Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+// Copyright (C) 2011  Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+
+/// \brief Test of QidGenerator
+///
+
+#include <gtest/gtest.h>
+
+#include <asiolink/qid_gen.h>
+#include <dns/message.h>
+
+// Tests the operation of the Qid generator
+
+// Check that getInstance returns a singleton
+TEST(QidGenerator, singleton) {
+    asiolink::QidGenerator* g1 = asiolink::QidGenerator::getInstance();
+    asiolink::QidGenerator* g2 = asiolink::QidGenerator::getInstance();
+
+    EXPECT_TRUE(g1 == g2);
+
+    asiolink::QidGenerator::cleanInstance();
+    // Is there any way to make sure a newly allocated one gets
+    // a new address?
+}
+
+TEST(QidGenerator, generate) {
+    // We'll assume that boost's generator is 'good enough', and won't
+    // do full statistical checking here. Let's just call it the xkcd
+    // test (http://xkcd.com/221/), and check if three consecutive
+    // generates are not all the same.
+    isc::dns::qid_t one, two, three;
+    asiolink::QidGenerator* gen = asiolink::QidGenerator::getInstance();
+    one = gen->generateQid();
+    two = gen->generateQid();
+    three = gen->generateQid();
+    ASSERT_FALSE((one == two) && (one == three));
+}